The young boy's family members could also be important characters. They might be initially unaware of the boy's encounter with the manmade demigod but later get involved. For example, the boy's father could be a skeptic at first but then become a believer and support the boy in his adventures with the demigod. And of course, there could be other characters in the world where the story is set, such as neighbors or local authorities, who react to the presence of the manmade demigod in different ways.
The plot might involve the young boy being chosen by the manmade demigod for a special mission. The demigod could be a creation of some powerful but unethical scientific experiment. The boy, with his innocence and courage, has to deal with the challenges that come with being associated with this demigod, such as facing those who want to use the demigod for evil purposes.
Well, it depends on how the author develops the story. It might focus on the boy's growth and struggles with his newfound powers. Or, it could have a complex plot involving battles against evil forces.
The man could be an ancient wizard. He has studied the arcane arts for centuries and has discovered the secret to creating demigods. He sees the young boy as a pure soul, someone who can handle the power without being corrupted.
Well, it happened through a series of challenges and quests that the boy had to overcome. Each victory granted him powers and gradually led to his demigod status.
Perhaps the fanfic could start with the young boy living an ordinary life. Then the man comes into his life and reveals that he can make the boy into a demigod. The boy is initially scared but also intrigued. As he is transformed, he starts to notice changes in himself, like enhanced strength and senses. However, there could be a dark side to this. There might be other forces that want to stop the man from creating demigods, and they target the young boy. So the boy has to not only come to terms with his new powers but also fight to protect himself and the man who made him a demigod.
The main characters would obviously be the demigod parent and the teacher. The demigod parent could be a character like a son or daughter of Zeus, for example. They would have all the powers and characteristics associated with being a demigod. The teacher could be a regular human, maybe a bit strict or overly curious, which would create interesting dynamics with the demigod parent.
It could be a tale of adventure and discovery as the boy navigates his unique identity. Maybe he has special powers or faces challenges related to his artificial creation.
One of the main characters could be a scientist. When the martian boy falls to earth, the scientist might be the first to discover him. The scientist would be curious about the boy's physiology and technology from Mars. Another character could be a young girl. She could befriend the martian boy and teach him about human emotions and relationships, which are very different from what he has on Mars.
Another character could be a villain who is hunting down any remaining Targaryens. He sees the orphan boy as a potential threat because he might grow up to claim power. This villain adds conflict and danger to the story, forcing the orphan boy and his newfound friends to constantly be on the run and develop strategies to outwit him.
There could be a Capitol official who has a strange fascination with the pizza boy. This official might try to manipulate the games to either help or harm the pizza boy, depending on his mood. Also, a tribute from a rich district who initially sees the pizza boy as an easy target but later realizes his unique skills could be an interesting main character. The rich tribute could then form an uneasy alliance with the pizza boy.